vBulletin 3 is end of life and will not be receiving future development. Warning: vBulletin 3.8.11 is not compatible with PHP 7.2.0 or higher.
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You cannot downgrade vBulletin. You need to restore the 3.8.11 files.
OR you must restore the database and files from the backup you took before upgrading, however you will lose any posts and members from after the upgrade.
Is there a method of procedure to downgrade from one version of 5.1 to a lesser version of same platform? In the event you're in the middle of an upgrade and it fails or you get errors, how to re-install...
I have the release version of the fourth and when you upgrade to the issuance of the fifth He talked to me a problem and are taking a very long time in the preparation of topics and often stop . ...
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